Sheet-metal cutter



April 29, 1930. H JUNKERS 1,756,362

SHEET METAL CUTTER Filed Oct. 5, 1925 Patented Apr. 29, 1930- UNITEDSTATES HUGO JUNKERS, 0F DESSAU, GERMANY SHEET-METAL CUTTER Applicationfiled October 5, 1925, Serial No. 60,696, and in Germany January 8,1925.

. My invention refers to devices for cutting thin sheet metal and moreespecially corrugated or other profilated sheet metal in par-' allel tothe corrugations or other profilations. It is an object of my inventionto simplify the cutting of such sheet metal by hand, to save time and toobtain a perfectly straight cutting edge extending strictly in parallelto the corrugation or the like..

The cutter according to this invention comprises a frame provided with agrip and having mounted at either end supporting and guiding rollersshaped to correspond to the corrugations or other profilations of thesheet metal. The cutters are preferablymounted on the frame intermediatethese supporting rollers. Preferably the lower cutter is exchangeablymounted on the frame while the upper cutter having the form of'a discforms one edge of a third roller guided in the corrugations or the likeof the sheet metal, this third roller being preferably wider at rightangles to the cuttingdirection than the guiding rollers and therebyincreasing the lateral stability of the tool during the cutting andfurther improving the accuracy of cutting. The two supporting andguiding rollers are preferably'arranged to run in one and the samecorrugation of the sheet metal.

The novel tool can be adapted to the 'cutting of sheet metal havingvarious profiles, but it is equally applicable to plane sheet metal. Bycorrespondingly arranging the cutters any desired cutting levelrelatively to the form of the profile can be obtained and owing to thecircumstance that the distance from the cutting edge to anypredetermined point of the profile remains the same throughout thecutting operation, no previous marking of the cutting line is required.

In the drawings afiixed to this specification and forming part thereof atool embodying my invent-ion is illustrated diagrammatically by way ofexample. In the drawings- Fig. 1 is a side elevation,

Fig. 2 is a horizontal section on the line IIII in Fig. 1, and w Fig. 3is a vertical section on the line IIIIII in Fig. 1.

Referring to the drawings, 1, 1 are the supporting and guiding rollersand 2 is the frame, at the ends of which these rollers are mounted, atbeing a grip forming part of the frame. The rollers 1, l are profilatedto correspond to the corrugations 10 of corrugated sheet metal such asshown at the bottom of Fig. 3, these rollers being arranged to run inone and the same corrugation. Onthe top edge of frame 2 is exchangeablymounted the lower cutter 5. 6 is the intermediate roller mounted on theframe, the edge 7 of the end face of this roller which adjoins theframe, forming a circular cutter cooperating with the lower cutter 5. 8is the bracket supporting the spindle of roller 6, which latter is Widerthan the rollers 1 and extends into a second corrugation of the metalsheet, as shown more especially in Fig. 3. When the tool is forcedacross the metal sheetin the direction of the arrow at in Fig. 1, withthe edgeof the sheet inserted between the cutters, the circular cutter 7will rotate and in cooperating with the stationary cutter 5 will cut thesheet in parallel to the corrugatioris.

I Wish it to be understood that I do not desire to be limited to theexact details of construction shown and described for obviousmodifications will occur to a person skilled in the art.

I claim l. A device for cutting corrugated sheet metal comprising aframe, two circumferentially corrugated rollers with parallel axesmounted in line on said frame to support a cutter on and to space samerelative to the 2. A device for cutting corrugated sheet metalcomprising a frame, two circumferentially corrugated rollers withparallel axes mounted in line on said frame to support a cutter on andto space same relative to the metal sheet to be cut, a third circumferemtially corrugated roller between said two rollers, a rotary cuttingelement formed on said third roller and a blade fixedto said frame incooperativerelation with said rotary cutting element and adapted toengage the lower face of the metal sheet.

In testimony whereof I aflix my signature.

HUGO J UN KERS.

